CVE-2026-40930
Published: May 19, 2026Last modified: May 21, 2026
Description
LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.4 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | LOW |
| Availability impact | LOW |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | libpng | Fixed (1.6.58-r0) |
| 25 LTS | libpng | Fixed (1.6.58-r0) | |
| Stream | libpng | Fixed (1.6.58-r1) | |
| Hardened Containers | 23 LTS | libpng | Fixed (1.6.58-r0) |
| 25 LTS | libpng | Fixed (1.6.58-r0) | |
| Stream | libpng | Fixed (1.6.58-r1) |